Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: tahoe-great-black-swamp (user goal)
[__0] rejecting: tahoe-great-black-swamp-0.4.0.1,
tahoe-great-black-swamp-0.3.1.0 (constraint from user target requires
==0.3.0.1)
[__0] trying: tahoe-great-black-swamp-0.3.0.1
[__1] next goal: tahoe-chk (dependency of tahoe-great-black-swamp)
[__1] rejecting: tahoe-chk-0.2.0.0 (conflict: tahoe-great-black-swamp =>
tahoe-chk>=0.1 && <0.2)
[__1] trying: tahoe-chk-0.1.0.2
[__2] next goal: memory (dependency of tahoe-chk)
[__2] rejecting: memory-0.18.0 (conflict: tahoe-chk => memory>=0.15 && <0.17)
[__2] skipping: memory-0.17.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=0.15 && <0.17' from
'tahoe-chk')
[__2] trying: memory-0.16.0
[__3] next goal: base (dependency of tahoe-great-black-swamp)
[__3] rejecting: base-4.16.3.0/installed-4.16.3.0 (conflict: memory =>
base<4.16)
[__3] skipping: base-4.19.0.0, base-4.18.1.0, base-4.18.0.0, base-4.17.2.0,
base-4.17.1.0, base-4.17.0.0, base-4.16.4.0, base-4.16.3.0, base-4.16.2.0,
base-4.16.1.0, base-4.16.0.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '<4.16' from 'memory')
[__3] rejecting: base-4.15.1.0, base-4.15.0.0, base-4.14.3.0, base-4.14.2.0,
base-4.14.1.0, base-4.14.0.0, base-4.13.0.0, base-4.12.0.0, base-4.11.1.0,
base-4.11.0.0, base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, base-4.9.0.0,
base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1,
base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0,
base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2,
base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2,
base-3.0.3.1 (constraint from non-upgradeable package requires installed
instance)
[__3] fail (backjumping, conflict set: base, memory, tahoe-great-black-swamp)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, memory, tahoe-chk,
tahoe-great-black-swamp
Try running with --minimize-conflict-set to improve the error message.